// Copyright 2006-2008 the V8 project authors. All rights reserved.
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
// * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
// * Redistributions in binary form must reproduce the above
// copyright notice, this list of conditions and the following
// disclaimer in the documentation and/or other materials provided
// with the distribution.
// * Neither the name of Google Inc. nor the names of its
// contributors may be used to endorse or promote products derived
// from this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#include "v8.h"
#include "accessors.h"
#include "api.h"
#include "bootstrapper.h"
#include "compiler.h"
#include "debug.h"
#include "execution.h"
#include "global-handles.h"
#include "macro-assembler.h"
#include "natives.h"
#include "objects-visiting.h"
#include "snapshot.h"
#include "extensions/externalize-string-extension.h"
#include "extensions/gc-extension.h"
namespace v8 {
namespace internal {
NativesExternalStringResource::NativesExternalStringResource(
Bootstrapper* bootstrapper,
const char* source)
: data_(source), length_(StrLength(source)) {
if (bootstrapper->delete_these_non_arrays_on_tear_down_ == NULL) {
bootstrapper->delete_these_non_arrays_on_tear_down_ = new List<char*>(2);
}
// The resources are small objects and we only make a fixed number of
// them, but let's clean them up on exit for neatness.
bootstrapper->delete_these_non_arrays_on_tear_down_->
Add(reinterpret_cast<char*>(this));
}
Bootstrapper::Bootstrapper()
: nesting_(0),
extensions_cache_(Script::TYPE_EXTENSION),
delete_these_non_arrays_on_tear_down_(NULL),
delete_these_arrays_on_tear_down_(NULL) {
}
Handle<String> Bootstrapper::NativesSourceLookup(int index) {
ASSERT(0 <= index && index < Natives::GetBuiltinsCount());
Isolate* isolate = Isolate::Current();
Factory* factory = isolate->factory();
Heap* heap = isolate->heap();
if (heap->natives_source_cache()->get(index)->IsUndefined()) {
if (!Snapshot::IsEnabled() || FLAG_new_snapshot) {
// We can use external strings for the natives.
NativesExternalStringResource* resource =
new NativesExternalStringResource(this,
Natives::GetScriptSource(index).start());
Handle<String> source_code =
factory->NewExternalStringFromAscii(resource);
heap->natives_source_cache()->set(index, *source_code);
} else {
// Old snapshot code can't cope with external strings at all.
Handle<String> source_code =
factory->NewStringFromAscii(Natives::GetScriptSource(index));
heap->natives_source_cache()->set(index, *source_code);
}
}
Handle<Object> cached_source(heap->natives_source_cache()->get(index));
return Handle<String>::cast(cached_source);
}
void Bootstrapper::Initialize(bool create_heap_objects) {
extensions_cache_.Initialize(create_heap_objects);
GCExtension::Register();
ExternalizeStringExtension::Register();
}
char* Bootstrapper::AllocateAutoDeletedArray(int bytes) {
char* memory = new char[bytes];
if (memory != NULL) {
if (delete_these_arrays_on_tear_down_ == NULL) {
delete_these_arrays_on_tear_down_ = new List<char*>(2);
}
delete_these_arrays_on_tear_down_->Add(memory);
}
return memory;
}
void Bootstrapper::TearDown() {
if (delete_these_non_arrays_on_tear_down_ != NULL) {
int len = delete_these_non_arrays_on_tear_down_->length();
ASSERT(len < 20); // Don't use this mechanism for unbounded allocations.
for (int i = 0; i < len; i++) {
delete delete_these_non_arrays_on_tear_down_->at(i);
delete_these_non_arrays_on_tear_down_->at(i) = NULL;
}
delete delete_these_non_arrays_on_tear_down_;
delete_these_non_arrays_on_tear_down_ = NULL;
}
if (delete_these_arrays_on_tear_down_ != NULL) {
int len = delete_these_arrays_on_tear_down_->length();
ASSERT(len < 1000); // Don't use this mechanism for unbounded allocations.
for (int i = 0; i < len; i++) {
delete[] delete_these_arrays_on_tear_down_->at(i);
delete_these_arrays_on_tear_down_->at(i) = NULL;
}
delete delete_these_arrays_on_tear_down_;
delete_these_arrays_on_tear_down_ = NULL;
}
extensions_cache_.Initialize(false); // Yes, symmetrical
}
class Genesis BASE_EMBEDDED {
public:
Genesis(Handle<Object> global_object,
v8::Handle<v8::ObjectTemplate> global_template,
v8::ExtensionConfiguration* extensions);
~Genesis() { }
Handle<Context> result() { return result_; }
Genesis* previous() { return previous_; }
private:
Handle<Context> global_context_;
// There may be more than one active genesis object: When GC is
// triggered during environment creation there may be weak handle
// processing callbacks which may create new environments.
Genesis* previous_;
Handle<Context> global_context() { return global_context_; }
// Creates some basic objects. Used for creating a context from scratch.
void CreateRoots();
// Creates the empty function. Used for creating a context from scratch.
Handle<JSFunction> CreateEmptyFunction();
// Creates the ThrowTypeError function. ECMA 5th Ed. 13.2.3
Handle<JSFunction> CreateThrowTypeErrorFunction(Builtins::Name builtin);
void CreateStrictModeFunctionMaps(Handle<JSFunction> empty);
// Creates the global objects using the global and the template passed in
// through the API. We call this regardless of whether we are building a
// context from scratch or using a deserialized one from the partial snapshot
// but in the latter case we don't use the objects it produces directly, as
// we have to used the deserialized ones that are linked together with the
// rest of the context snapshot.
Handle<JSGlobalProxy> CreateNewGlobals(
v8::Handle<v8::ObjectTemplate> global_template,
Handle<Object> global_object,
Handle<GlobalObject>* global_proxy_out);
// Hooks the given global proxy into the context. If the context was created
// by deserialization then this will unhook the global proxy that was
// deserialized, leaving the GC to pick it up.
void HookUpGlobalProxy(Handle<GlobalObject> inner_global,
Handle<JSGlobalProxy> global_proxy);
// Similarly, we want to use the inner global that has been created by the
// templates passed through the API. The inner global from the snapshot is
// detached from the other objects in the snapshot.
void HookUpInnerGlobal(Handle<GlobalObject> inner_global);
// New context initialization. Used for creating a context from scratch.
void InitializeGlobal(Handle<GlobalObject> inner_global,
Handle<JSFunction> empty_function);
// Installs the contents of the native .js files on the global objects.
// Used for creating a context from scratch.
void InstallNativeFunctions();
bool InstallNatives();
void InstallBuiltinFunctionIds();
void InstallJSFunctionResultCaches();
void InitializeNormalizedMapCaches();
// Used both for deserialized and from-scratch contexts to add the extensions
// provided.
static bool InstallExtensions(Handle<Context> global_context,
v8::ExtensionConfiguration* extensions);
static bool InstallExtension(const char* name);
static bool InstallExtension(v8::RegisteredExtension* current);
static void InstallSpecialObjects(Handle<Context> global_context);
bool InstallJSBuiltins(Handle<JSBuiltinsObject> builtins);
bool ConfigureApiObject(Handle<JSObject> object,
Handle<ObjectTemplateInfo> object_template);
bool ConfigureGlobalObjects(v8::Handle<v8::ObjectTemplate> global_template);
// Migrates all properties from the 'from' object to the 'to'
// object and overrides the prototype in 'to' with the one from
// 'from'.
void TransferObject(Handle<JSObject> from, Handle<JSObject> to);
void TransferNamedProperties(Handle<JSObject> from, Handle<JSObject> to);
void TransferIndexedProperties(Handle<JSObject> from, Handle<JSObject> to);
enum PrototypePropertyMode {
DONT_ADD_PROTOTYPE,
ADD_READONLY_PROTOTYPE,
ADD_WRITEABLE_PROTOTYPE
};
Handle<Map> CreateFunctionMap(PrototypePropertyMode prototype_mode);
Handle<DescriptorArray> ComputeFunctionInstanceDescriptor(
PrototypePropertyMode prototypeMode);
void MakeFunctionInstancePrototypeWritable();
Handle<Map> CreateStrictModeFunctionMap(
PrototypePropertyMode prototype_mode,
Handle<JSFunction> empty_function,
Handle<FixedArray> arguments_callbacks,
Handle<FixedArray> caller_callbacks);
Handle<DescriptorArray> ComputeStrictFunctionInstanceDescriptor(
PrototypePropertyMode propertyMode,
Handle<FixedArray> arguments,
Handle<FixedArray> caller);
static bool CompileBuiltin(int index);
static bool CompileNative(Vector<const char> name, Handle<String> source);
static bool CompileScriptCached(Vector<const char> name,
Handle<String> source,
SourceCodeCache* cache,
v8::Extension* extension,
Handle<Context> top_context,
bool use_runtime_context);
Handle<Context> result_;
// Function instance maps. Function literal maps are created initially with
// a read only prototype for the processing of JS builtins. Later the function
// instance maps are replaced in order to make prototype writable.
// These are the final, writable prototype, maps.
Handle<Map> function_instance_map_writable_prototype_;
Handle<Map> strict_mode_function_instance_map_writable_prototype_;
BootstrapperActive active_;
friend class Bootstrapper;
};
void Bootstrapper::Iterate(ObjectVisitor* v) {
extensions_cache_.Iterate(v);
v->Synchronize("Extensions");
}
Handle<Context> Bootstrapper::CreateEnvironment(
Handle<Object> global_object,
v8::Handle<v8::ObjectTemplate> global_template,
v8::ExtensionConfiguration* extensions) {
HandleScope scope;
Handle<Context> env;
Genesis genesis(global_object, global_template, extensions);
env = genesis.result();
if (!env.is_null()) {
if (InstallExtensions(env, extensions)) {
return env;
}
}
return Handle<Context>();
}
static void SetObjectPrototype(Handle<JSObject> object, Handle<Object> proto) {
// object.__proto__ = proto;
Handle<Map> old_to_map = Handle<Map>(object->map());
Handle<Map> new_to_map = FACTORY->CopyMapDropTransitions(old_to_map);
new_to_map->set_prototype(*proto);
object->set_map(*new_to_map);
}
void Bootstrapper::DetachGlobal(Handle<Context> env) {
Factory* factory = Isolate::Current()->factory();
JSGlobalProxy::cast(env->global_proxy())->set_context(*factory->null_value());
SetObjectPrototype(Handle<JSObject>(env->global_proxy()),
factory->null_value());
env->set_global_proxy(env->global());
env->global()->set_global_receiver(env->global());
}
void Bootstrapper::ReattachGlobal(Handle<Context> env,
Handle<Object> global_object) {
ASSERT(global_object->IsJSGlobalProxy());
Handle<JSGlobalProxy> global = Handle<JSGlobalProxy>::cast(global_object);
env->global()->set_global_receiver(*global);
env->set_global_proxy(*global);
SetObjectPrototype(global, Handle<JSObject>(env->global()));
global->set_context(*env);
}
static Handle<JSFunction> InstallFunction(Handle<JSObject> target,
const char* name,
InstanceType type,
int instance_size,
Handle<JSObject> prototype,
Builtins::Name call,
bool is_ecma_native) {
Isolate* isolate = Isolate::Current();
Factory* factory = isolate->factory();
Handle<String> symbol = factory->LookupAsciiSymbol(name);
Handle<Code> call_code = Handle<Code>(isolate->builtins()->builtin(call));
Handle<JSFunction> function = prototype.is_null() ?
factory->NewFunctionWithoutPrototype(symbol, call_code) :
factory->NewFunctionWithPrototype(symbol,
type,
instance_size,
prototype,
call_code,
is_ecma_native);
SetLocalPropertyNoThrow(target, symbol, function, DONT_ENUM);
if (is_ecma_native) {
function->shared()->set_instance_class_name(*symbol);
}
return function;
}
Handle<DescriptorArray> Genesis::ComputeFunctionInstanceDescriptor(
PrototypePropertyMode prototypeMode) {
Factory* factory = Isolate::Current()->factory();
Handle<DescriptorArray> descriptors =
factory->NewDescriptorArray(prototypeMode == DONT_ADD_PROTOTYPE ? 4 : 5);
PropertyAttributes attributes =
static_cast<PropertyAttributes>(DONT_ENUM | DONT_DELETE | READ_ONLY);
{ // Add length.
Handle<Proxy> proxy = factory->NewProxy(&Accessors::FunctionLength);
CallbacksDescriptor d(*factory->length_symbol(), *proxy, attributes);
descriptors->Set(0, &d);
}
{ // Add name.
Handle<Proxy> proxy = factory->NewProxy(&Accessors::FunctionName);
CallbacksDescriptor d(*factory->name_symbol(), *proxy, attributes);
descriptors->Set(1, &d);
}
{ // Add arguments.
Handle<Proxy> proxy = factory->NewProxy(&Accessors::FunctionArguments);
CallbacksDescriptor d(*factory->arguments_symbol(), *proxy, attributes);
descriptors->Set(2, &d);
}
{ // Add caller.
Handle<Proxy> proxy = factory->NewProxy(&Accessors::FunctionCaller);
CallbacksDescriptor d(*factory->caller_symbol(), *proxy, attributes);
descriptors->Set(3, &d);
}
if (prototypeMode != DONT_ADD_PROTOTYPE) {
// Add prototype.
if (prototypeMode == ADD_WRITEABLE_PROTOTYPE) {
attributes = static_cast<PropertyAttributes>(attributes & ~READ_ONLY);
}
Handle<Proxy> proxy = factory->NewProxy(&Accessors::FunctionPrototype);
CallbacksDescriptor d(*factory->prototype_symbol(), *proxy, attributes);
descriptors->Set(4, &d);
}
descriptors->Sort();
return descriptors;
}
Handle<Map> Genesis::CreateFunctionMap(PrototypePropertyMode prototype_mode) {
Handle<Map> map = FACTORY->NewMap(JS_FUNCTION_TYPE, JSFunction::kSize);
Handle<DescriptorArray> descriptors =
ComputeFunctionInstanceDescriptor(prototype_mode);
map->set_instance_descriptors(*descriptors);
map->set_function_with_prototype(prototype_mode != DONT_ADD_PROTOTYPE);
return map;
}
Handle<JSFunction> Genesis::CreateEmptyFunction() {
// Allocate the map for function instances. Maps are allocated first and their
// prototypes patched later, once empty function is created.
// Please note that the prototype property for function instances must be
// writable.
Handle<Map> function_instance_map =
CreateFunctionMap(ADD_WRITEABLE_PROTOTYPE);
global_context()->set_function_instance_map(*function_instance_map);
// Functions with this map will not have a 'prototype' property, and
// can not be used as constructors.
Handle<Map> function_without_prototype_map =
CreateFunctionMap(DONT_ADD_PROTOTYPE);
global_context()->set_function_without_prototype_map(
*function_without_prototype_map);
// Allocate the function map. This map is temporary, used only for processing
// of builtins.
// Later the map is replaced with writable prototype map, allocated below.
Handle<Map> function_map = CreateFunctionMap(ADD_READONLY_PROTOTYPE);
global_context()->set_function_map(*function_map);
// The final map for functions. Writeable prototype.
// This map is installed in MakeFunctionInstancePrototypeWritable.
function_instance_map_writable_prototype_ =
CreateFunctionMap(ADD_WRITEABLE_PROTOTYPE);
Isolate* isolate = Isolate::Current();
Factory* factory = isolate->factory();
Heap* heap = isolate->heap();
Handle<String> object_name = Handle<String>(heap->Object_symbol());
{ // --- O b j e c t ---
Handle<JSFunction> object_fun =
factory->NewFunction(object_name, factory->null_value());
Handle<Map> object_function_map =
factory->NewMap(JS_OBJECT_TYPE, JSObject::kHeaderSize);
object_fun->set_initial_map(*object_function_map);
object_function_map->set_constructor(*object_fun);
global_context()->set_object_function(*object_fun);
// Allocate a new prototype for the object function.
Handle<JSObject> prototype = factory->NewJSObject(
isolate->object_function(),
TENURED);
global_context()->set_initial_object_prototype(*prototype);
SetPrototype(object_fun, prototype);
object_function_map->
set_instance_descriptors(heap->empty_descriptor_array());
}
// Allocate the empty function as the prototype for function ECMAScript
// 262 15.3.4.
Handle<String> symbol = factory->LookupAsciiSymbol("Empty");
Handle<JSFunction> empty_function =
factory->NewFunctionWithoutPrototype(symbol, kNonStrictMode);
// --- E m p t y ---
Handle<Code> code =
Handle<Code>(isolate->builtins()->builtin(
Builtins::kEmptyFunction));
empty_function->set_code(*code);
empty_function->shared()->set_code(*code);
Handle<String> source = factory->NewStringFromAscii(CStrVector("() {}"));
Handle<Script> script = factory->NewScript(source);
script->set_type(Smi::FromInt(Script::TYPE_NATIVE));
empty_function->shared()->set_script(*script);
empty_function->shared()->set_start_position(0);
empty_function->shared()->set_end_position(source->length());
empty_function->shared()->DontAdaptArguments();
// Set prototypes for the function maps.
global_context()->function_map()->set_prototype(*empty_function);
global_context()->function_instance_map()->set_prototype(*empty_function);
global_context()->function_without_prototype_map()->
set_prototype(*empty_function);
function_instance_map_writable_prototype_->set_prototype(*empty_function);
// Allocate the function map first and then patch the prototype later
Handle<Map> empty_fm = factory->CopyMapDropDescriptors(
function_without_prototype_map);
empty_fm->set_instance_descriptors(
function_without_prototype_map->instance_descriptors());
empty_fm->set_prototype(global_context()->object_function()->prototype());
empty_function->set_map(*empty_fm);
return empty_function;
}
Handle<DescriptorArray> Genesis::ComputeStrictFunctionInstanceDescriptor(
PrototypePropertyMode prototypeMode,
Handle<FixedArray> arguments,
Handle<FixedArray> caller) {
Factory* factory = Isolate::Current()->factory();
Handle<DescriptorArray> descriptors =
factory->NewDescriptorArray(prototypeMode == DONT_ADD_PROTOTYPE ? 4 : 5);
PropertyAttributes attributes = static_cast<PropertyAttributes>(
DONT_ENUM | DONT_DELETE | READ_ONLY);
{ // length
Handle<Proxy> proxy = factory->NewProxy(&Accessors::FunctionLength);
CallbacksDescriptor d(*factory->length_symbol(), *proxy, attributes);
descriptors->Set(0, &d);
}
{ // name
Handle<Proxy> proxy = factory->NewProxy(&Accessors::FunctionName);
CallbacksDescriptor d(*factory->name_symbol(), *proxy, attributes);
descriptors->Set(1, &d);
}
{ // arguments
CallbacksDescriptor d(*factory->arguments_symbol(), *arguments, attributes);
descriptors->Set(2, &d);
}
{ // caller
CallbacksDescriptor d(*factory->caller_symbol(), *caller, attributes);
descriptors->Set(3, &d);
}
// prototype
if (prototypeMode != DONT_ADD_PROTOTYPE) {
if (prototypeMode == ADD_WRITEABLE_PROTOTYPE) {
attributes = static_cast<PropertyAttributes>(attributes & ~READ_ONLY);
}
Handle<Proxy> proxy = factory->NewProxy(&Accessors::FunctionPrototype);
CallbacksDescriptor d(*factory->prototype_symbol(), *proxy, attributes);
descriptors->Set(4, &d);
}
descriptors->Sort();
return descriptors;
}
// ECMAScript 5th Edition, 13.2.3
Handle<JSFunction> Genesis::CreateThrowTypeErrorFunction(
Builtins::Name builtin) {
Isolate* isolate = Isolate::Current();
Factory* factory = isolate->factory();
Handle<String> name = factory->LookupAsciiSymbol("ThrowTypeError");
Handle<JSFunction> throw_type_error =
factory->NewFunctionWithoutPrototype(name, kStrictMode);
Handle<Code> code = Handle<Code>(
isolate->builtins()->builtin(builtin));
throw_type_error->set_map(global_context()->strict_mode_function_map());
throw_type_error->set_code(*code);
throw_type_error->shared()->set_code(*code);
throw_type_error->shared()->DontAdaptArguments();
PreventExtensions(throw_type_error);
return throw_type_error;
}
Handle<Map> Genesis::CreateStrictModeFunctionMap(
PrototypePropertyMode prototype_mode,
Handle<JSFunction> empty_function,
Handle<FixedArray> arguments_callbacks,
Handle<FixedArray> caller_callbacks) {
Handle<Map> map = FACTORY->NewMap(JS_FUNCTION_TYPE, JSFunction::kSize);
Handle<DescriptorArray> descriptors =
ComputeStrictFunctionInstanceDescriptor(prototype_mode,
arguments_callbacks,
caller_callbacks);
map->set_instance_descriptors(*descriptors);
map->set_function_with_prototype(prototype_mode != DONT_ADD_PROTOTYPE);
map->set_prototype(*empty_function);
return map;
}
void Genesis::CreateStrictModeFunctionMaps(Handle<JSFunction> empty) {
// Create the callbacks arrays for ThrowTypeError functions.
// The get/set callacks are filled in after the maps are created below.
Factory* factory = Isolate::Current()->factory();
Handle<FixedArray> arguments = factory->NewFixedArray(2, TENURED);
Handle<FixedArray> caller = factory->NewFixedArray(2, TENURED);
// Allocate map for the strict mode function instances.
Handle<Map> strict_mode_function_instance_map =
CreateStrictModeFunctionMap(
ADD_WRITEABLE_PROTOTYPE, empty, arguments, caller);
global_context()->set_strict_mode_function_instance_map(
*strict_mode_function_instance_map);
// Allocate map for the prototype-less strict mode instances.
Handle<Map> strict_mode_function_without_prototype_map =
CreateStrictModeFunctionMap(
DONT_ADD_PROTOTYPE, empty, arguments, caller);
global_context()->set_strict_mode_function_without_prototype_map(
*strict_mode_function_without_prototype_map);
// Allocate map for the strict mode functions. This map is temporary, used
// only for processing of builtins.
// Later the map is replaced with writable prototype map, allocated below.
Handle<Map> strict_mode_function_map =
CreateStrictModeFunctionMap(
ADD_READONLY_PROTOTYPE, empty, arguments, caller);
global_context()->set_strict_mode_function_map(
*strict_mode_function_map);
// The final map for the strict mode functions. Writeable prototype.
// This map is installed in MakeFunctionInstancePrototypeWritable.
strict_mode_function_instance_map_writable_prototype_ =
CreateStrictModeFunctionMap(
ADD_WRITEABLE_PROTOTYPE, empty, arguments, caller);
// Create the ThrowTypeError function instances.
Handle<JSFunction> arguments_throw =
CreateThrowTypeErrorFunction(Builtins::kStrictFunctionArguments);
Handle<JSFunction> caller_throw =
CreateThrowTypeErrorFunction(Builtins::kStrictFunctionCaller);
// Complete the callback fixed arrays.
arguments->set(0, *arguments_throw);
arguments->set(1, *arguments_throw);
caller->set(0, *caller_throw);
caller->set(1, *caller_throw);
}
static void AddToWeakGlobalContextList(Context* context) {
ASSERT(context->IsGlobalContext());
Heap* heap = Isolate::Current()->heap();
#ifdef DEBUG
{ // NOLINT
ASSERT(context->get(Context::NEXT_CONTEXT_LINK)->IsUndefined());
// Check that context is not in the list yet.
for (Object* current = heap->global_contexts_list();
!current->IsUndefined();
current = Context::cast(current)->get(Context::NEXT_CONTEXT_LINK)) {
ASSERT(current != context);
}
}
#endif
context->set(Context::NEXT_CONTEXT_LINK, heap->global_contexts_list());
heap->set_global_contexts_list(context);
}
void Genesis::CreateRoots() {
Isolate* isolate = Isolate::Current();
// Allocate the global context FixedArray first and then patch the
// closure and extension object later (we need the empty function
// and the global object, but in order to create those, we need the
// global context).
global_context_ = Handle<Context>::cast(isolate->global_handles()->Create(
*isolate->factory()->NewGlobalContext()));
AddToWeakGlobalContextList(*global_context_);
isolate->set_context(*global_context());
// Allocate the message listeners object.
{
v8::NeanderArray listeners;
global_context()->set_message_listeners(*listeners.value());
}
}
Handle<JSGlobalProxy> Genesis::CreateNewGlobals(
v8::Handle<v8::ObjectTemplate> global_template,
Handle<Object> global_object,
Handle<GlobalObject>* inner_global_out) {
// The argument global_template aka data is an ObjectTemplateInfo.
// It has a constructor pointer that points at global_constructor which is a
// FunctionTemplateInfo.
// The global_constructor is used to create or reinitialize the global_proxy.
// The global_constructor also has a prototype_template pointer that points at
// js_global_template which is an ObjectTemplateInfo.
// That in turn has a constructor pointer that points at
// js_global_constructor which is a FunctionTemplateInfo.
// js_global_constructor is used to make js_global_function
// js_global_function is used to make the new inner_global.
//
// --- G l o b a l ---
// Step 1: Create a fresh inner JSGlobalObject.
Handle<JSFunction> js_global_function;
Handle<ObjectTemplateInfo> js_global_template;
if (!global_template.IsEmpty()) {
// Get prototype template of the global_template.
Handle<ObjectTemplateInfo> data =
v8::Utils::OpenHandle(*global_template);
Handle<FunctionTemplateInfo> global_constructor =
Handle<FunctionTemplateInfo>(
FunctionTemplateInfo::cast(data->constructor()));
Handle<Object> proto_template(global_constructor->prototype_template());
if (!proto_template->IsUndefined()) {
js_global_template =
Handle<ObjectTemplateInfo>::cast(proto_template);
}
}
Isolate* isolate = Isolate::Current();
Factory* factory = isolate->factory();
Heap* heap = isolate->heap();
if (js_global_template.is_null()) {
Handle<String> name = Handle<String>(heap->empty_symbol());
Handle<Code> code = Handle<Code>(isolate->builtins()->builtin(
Builtins::kIllegal));
js_global_function =
factory->NewFunction(name, JS_GLOBAL_OBJECT_TYPE,
JSGlobalObject::kSize, code, true);
// Change the constructor property of the prototype of the
// hidden global function to refer to the Object function.
Handle<JSObject> prototype =
Handle<JSObject>(
JSObject::cast(js_global_function->instance_prototype()));
SetLocalPropertyNoThrow(
prototype,
factory->constructor_symbol(),
isolate->object_function(),
NONE);
} else {
Handle<FunctionTemplateInfo> js_global_constructor(
FunctionTemplateInfo::cast(js_global_template->constructor()));
js_global_function =
factory->CreateApiFunction(js_global_constructor,
factory->InnerGlobalObject);
}
js_global_function->initial_map()->set_is_hidden_prototype();
Handle<GlobalObject> inner_global =
factory->NewGlobalObject(js_global_function);
if (inner_global_out != NULL) {
*inner_global_out = inner_global;
}
// Step 2: create or re-initialize the global proxy object.
Handle<JSFunction> global_proxy_function;
if (global_template.IsEmpty()) {
Handle<String> name = Handle<String>(heap->empty_symbol());
Handle<Code> code = Handle<Code>(isolate->builtins()->builtin(
Builtins::kIllegal));
global_proxy_function =
factory->NewFunction(name, JS_GLOBAL_PROXY_TYPE,
JSGlobalProxy::kSize, code, true);
} else {
Handle<ObjectTemplateInfo> data =
v8::Utils::OpenHandle(*global_template);
Handle<FunctionTemplateInfo> global_constructor(
FunctionTemplateInfo::cast(data->constructor()));
global_proxy_function =
factory->CreateApiFunction(global_constructor,
factory->OuterGlobalObject);
}
Handle<String> global_name = factory->LookupAsciiSymbol("global");
global_proxy_function->shared()->set_instance_class_name(*global_name);
global_proxy_function->initial_map()->set_is_access_check_needed(true);
// Set global_proxy.__proto__ to js_global after ConfigureGlobalObjects
// Return the global proxy.
if (global_object.location() != NULL) {
ASSERT(global_object->IsJSGlobalProxy());
return ReinitializeJSGlobalProxy(
global_proxy_function,
Handle<JSGlobalProxy>::cast(global_object));
} else {
return Handle<JSGlobalProxy>::cast(
factory->NewJSObject(global_proxy_function, TENURED));
}
}
void Genesis::HookUpGlobalProxy(Handle<GlobalObject> inner_global,
Handle<JSGlobalProxy> global_proxy) {
// Set the global context for the global object.
inner_global->set_global_context(*global_context());
inner_global->set_global_receiver(*global_proxy);
global_proxy->set_context(*global_context());
global_context()->set_global_proxy(*global_proxy);
}
void Genesis::HookUpInnerGlobal(Handle<GlobalObject> inner_global) {
Handle<GlobalObject> inner_global_from_snapshot(
GlobalObject::cast(global_context_->extension()));
Handle<JSBuiltinsObject> builtins_global(global_context_->builtins());
global_context_->set_extension(*inner_global);
global_context_->set_global(*inner_global);
global_context_->set_security_token(*inner_global);
static const PropertyAttributes attributes =
static_cast<PropertyAttributes>(READ_ONLY | DONT_DELETE);
ForceSetProperty(builtins_global,
FACTORY->LookupAsciiSymbol("global"),
inner_global,
attributes);
// Setup the reference from the global object to the builtins object.
JSGlobalObject::cast(*inner_global)->set_builtins(*builtins_global);
TransferNamedProperties(inner_global_from_snapshot, inner_global);
TransferIndexedProperties(inner_global_from_snapshot, inner_global);
}
// This is only called if we are not using snapshots. The equivalent
// work in the snapshot case is done in HookUpInnerGlobal.
void Genesis::InitializeGlobal(Handle<GlobalObject> inner_global,
Handle<JSFunction> empty_function) {
// --- G l o b a l C o n t e x t ---
// Use the empty function as closure (no scope info).
global_context()->set_closure(*empty_function);
global_context()->set_fcontext(*global_context());
global_context()->set_previous(NULL);
// Set extension and global object.
global_context()->set_extension(*inner_global);
global_context()->set_global(*inner_global);
// Security setup: Set the security token of the global object to
// its the inner global. This makes the security check between two
// different contexts fail by default even in case of global
// object reinitialization.
global_context()->set_security_token(*inner_global);
Isolate* isolate = Isolate::Current();
Factory* factory = isolate->factory();
Heap* heap = isolate->heap();
Handle<String> object_name = Handle<String>(heap->Object_symbol());
SetLocalPropertyNoThrow(inner_global, object_name,
isolate->object_function(), DONT_ENUM);
Handle<JSObject> global = Handle<JSObject>(global_context()->global());
// Install global Function object
InstallFunction(global, "Function", JS_FUNCTION_TYPE, JSFunction::kSize,
empty_function, Builtins::kIllegal, true); // ECMA native.
{ // --- A r r a y ---
Handle<JSFunction> array_function =
InstallFunction(global, "Array", JS_ARRAY_TYPE, JSArray::kSize,
isolate->initial_object_prototype(),
Builtins::kArrayCode, true);
array_function->shared()->set_construct_stub(
isolate->builtins()->builtin(Builtins::kArrayConstructCode));
array_function->shared()->DontAdaptArguments();
// This seems a bit hackish, but we need to make sure Array.length
// is 1.
array_function->shared()->set_length(1);
Handle<DescriptorArray> array_descriptors =
factory->CopyAppendProxyDescriptor(
factory->empty_descriptor_array(),
factory->length_symbol(),
factory->NewProxy(&Accessors::ArrayLength),
static_cast<PropertyAttributes>(DONT_ENUM | DONT_DELETE));
// Cache the fast JavaScript array map
global_context()->set_js_array_map(array_function->initial_map());
global_context()->js_array_map()->set_instance_descriptors(
*array_descriptors);
// array_function is used internally. JS code creating array object should
// search for the 'Array' property on the global object and use that one
// as the constructor. 'Array' property on a global object can be
// overwritten by JS code.
global_context()->set_array_function(*array_function);
}
{ // --- N u m b e r ---
Handle<JSFunction> number_fun =
InstallFunction(global, "Number", JS_VALUE_TYPE, JSValue::kSize,
isolate->initial_object_prototype(),
Builtins::kIllegal, true);
global_context()->set_number_function(*number_fun);
}
{ // --- B o o l e a n ---
Handle<JSFunction> boolean_fun =
InstallFunction(global, "Boolean", JS_VALUE_TYPE, JSValue::kSize,
isolate->initial_object_prototype(),
Builtins::kIllegal, true);
global_context()->set_boolean_function(*boolean_fun);
}
{ // --- S t r i n g ---
Handle<JSFunction> string_fun =
InstallFunction(global, "String", JS_VALUE_TYPE, JSValue::kSize,
isolate->initial_object_prototype(),
Builtins::kIllegal, true);
string_fun->shared()->set_construct_stub(
isolate->builtins()->builtin(Builtins::kStringConstructCode));
global_context()->set_string_function(*string_fun);
// Add 'length' property to strings.
Handle<DescriptorArray> string_descriptors =
factory->CopyAppendProxyDescriptor(
factory->empty_descriptor_array(),
factory->length_symbol(),
factory->NewProxy(&Accessors::StringLength),
static_cast<PropertyAttributes>(DONT_ENUM |
DONT_DELETE |
READ_ONLY));
Handle<Map> string_map =
Handle<Map>(global_context()->string_function()->initial_map());
string_map->set_instance_descriptors(*string_descriptors);
}
{ // --- D a t e ---
// Builtin functions for Date.prototype.
Handle<JSFunction> date_fun =
InstallFunction(global, "Date", JS_VALUE_TYPE, JSValue::kSize,
isolate->initial_object_prototype(),
Builtins::kIllegal, true);
global_context()->set_date_function(*date_fun);
}
{ // -- R e g E x p
// Builtin functions for RegExp.prototype.
Handle<JSFunction> regexp_fun =
InstallFunction(global, "RegExp", JS_REGEXP_TYPE, JSRegExp::kSize,
isolate->initial_object_prototype(),
Builtins::kIllegal, true);
global_context()->set_regexp_function(*regexp_fun);
ASSERT(regexp_fun->has_initial_map());
Handle<Map> initial_map(regexp_fun->initial_map());
ASSERT_EQ(0, initial_map->inobject_properties());
Handle<DescriptorArray> descriptors = factory->NewDescriptorArray(5);
PropertyAttributes final =
static_cast<PropertyAttributes>(DONT_ENUM | DONT_DELETE | READ_ONLY);
int enum_index = 0;
{
// ECMA-262, section 15.10.7.1.
FieldDescriptor field(heap->source_symbol(),
JSRegExp::kSourceFieldIndex,
final,
enum_index++);
descriptors->Set(0, &field);
}
{
// ECMA-262, section 15.10.7.2.
FieldDescriptor field(heap->global_symbol(),
JSRegExp::kGlobalFieldIndex,
final,
enum_index++);
descriptors->Set(1, &field);
}
{
// ECMA-262, section 15.10.7.3.
FieldDescriptor field(heap->ignore_case_symbol(),
JSRegExp::kIgnoreCaseFieldIndex,
final,
enum_index++);
descriptors->Set(2, &field);
}
{
// ECMA-262, section 15.10.7.4.
FieldDescriptor field(heap->multiline_symbol(),
JSRegExp::kMultilineFieldIndex,
final,
enum_index++);
descriptors->Set(3, &field);
}
{
// ECMA-262, section 15.10.7.5.
PropertyAttributes writable =
static_cast<PropertyAttributes>(DONT_ENUM | DONT_DELETE);
FieldDescriptor field(heap->last_index_symbol(),
JSRegExp::kLastIndexFieldIndex,
writable,
enum_index++);
descriptors->Set(4, &field);
}
descriptors->SetNextEnumerationIndex(enum_index);
descriptors->Sort();
initial_map->set_inobject_properties(5);
initial_map->set_pre_allocated_property_fields(5);
initial_map->set_unused_property_fields(0);
initial_map->set_instance_size(
initial_map->instance_size() + 5 * kPointerSize);
initial_map->set_instance_descriptors(*descriptors);
initial_map->set_visitor_id(StaticVisitorBase::GetVisitorId(*initial_map));
}
{ // -- J S O N
Handle<String> name = factory->NewStringFromAscii(CStrVector("JSON"));
Handle<JSFunction> cons = factory->NewFunction(
name,
factory->the_hole_value());
cons->SetInstancePrototype(global_context()->initial_object_prototype());
cons->SetInstanceClassName(*name);
Handle<JSObject> json_object = factory->NewJSObject(cons, TENURED);
ASSERT(json_object->IsJSObject());
SetLocalPropertyNoThrow(global, name, json_object, DONT_ENUM);
global_context()->set_json_object(*json_object);
}
{ // --- arguments_boilerplate_
// Make sure we can recognize argument objects at runtime.
// This is done by introducing an anonymous function with
// class_name equals 'Arguments'.
Handle<String> symbol = factory->LookupAsciiSymbol("Arguments");
Handle<Code> code = Handle<Code>(
isolate->builtins()->builtin(Builtins::kIllegal));
Handle<JSObject> prototype =
Handle<JSObject>(
JSObject::cast(global_context()->object_function()->prototype()));
Handle<JSFunction> function =
factory->NewFunctionWithPrototype(symbol,
JS_OBJECT_TYPE,
JSObject::kHeaderSize,
prototype,
code,
false);
ASSERT(!function->has_initial_map());
function->shared()->set_instance_class_name(*symbol);
function->shared()->set_expected_nof_properties(2);
Handle<JSObject> result = factory->NewJSObject(function);
global_context()->set_arguments_boilerplate(*result);
// Note: length must be added as the first property and
// callee must be added as the second property.
SetLocalPropertyNoThrow(result, factory->length_symbol(),
factory->undefined_value(),
DONT_ENUM);
SetLocalPropertyNoThrow(result, factory->callee_symbol(),
factory->undefined_value(),
DONT_ENUM);
#ifdef DEBUG
LookupResult lookup;
result->LocalLookup(heap->callee_symbol(), &lookup);
ASSERT(lookup.IsProperty() && (lookup.type() == FIELD));
ASSERT(lookup.GetFieldIndex() == Heap::kArgumentsCalleeIndex);
result->LocalLookup(heap->length_symbol(), &lookup);
ASSERT(lookup.IsProperty() && (lookup.type() == FIELD));
ASSERT(lookup.GetFieldIndex() == Heap::kArgumentsLengthIndex);
ASSERT(result->map()->inobject_properties() > Heap::kArgumentsCalleeIndex);
ASSERT(result->map()->inobject_properties() > Heap::kArgumentsLengthIndex);
// Check the state of the object.
ASSERT(result->HasFastProperties());
ASSERT(result->HasFastElements());
#endif
}
{ // --- strict mode arguments boilerplate
const PropertyAttributes attributes =
static_cast<PropertyAttributes>(DONT_ENUM | DONT_DELETE | READ_ONLY);
// Create the ThrowTypeError functions.
Handle<FixedArray> callee = factory->NewFixedArray(2, TENURED);
Handle<FixedArray> caller = factory->NewFixedArray(2, TENURED);
Handle<JSFunction> callee_throw =
CreateThrowTypeErrorFunction(Builtins::kStrictArgumentsCallee);
Handle<JSFunction> caller_throw =
CreateThrowTypeErrorFunction(Builtins::kStrictArgumentsCaller);
// Install the ThrowTypeError functions.
callee->set(0, *callee_throw);
callee->set(1, *callee_throw);
caller->set(0, *caller_throw);
caller->set(1, *caller_throw);
// Create the descriptor array for the arguments object.
Handle<DescriptorArray> descriptors = factory->NewDescriptorArray(3);
{ // length
FieldDescriptor d(*factory->length_symbol(), 0, DONT_ENUM);
descriptors->Set(0, &d);
}
{ // callee
CallbacksDescriptor d(*factory->callee_symbol(), *callee, attributes);
descriptors->Set(1, &d);
}
{ // caller
CallbacksDescriptor d(*factory->caller_symbol(), *caller, attributes);
descriptors->Set(2, &d);
}
descriptors->Sort();
// Create the map. Allocate one in-object field for length.
Handle<Map> map = factory->NewMap(JS_OBJECT_TYPE,
Heap::kArgumentsObjectSizeStrict);
map->set_instance_descriptors(*descriptors);
map->set_function_with_prototype(true);
map->set_prototype(global_context()->object_function()->prototype());
map->set_pre_allocated_property_fields(1);
map->set_inobject_properties(1);
// Copy constructor from the non-strict arguments boilerplate.
map->set_constructor(
global_context()->arguments_boilerplate()->map()->constructor());
// Allocate the arguments boilerplate object.
Handle<JSObject> result = factory->NewJSObjectFromMap(map);
global_context()->set_strict_mode_arguments_boilerplate(*result);
// Add length property only for strict mode boilerplate.
SetLocalPropertyNoThrow(result, factory->length_symbol(),
factory->undefined_value(),
DONT_ENUM);
#ifdef DEBUG
LookupResult lookup;
result->LocalLookup(heap->length_symbol(), &lookup);
ASSERT(lookup.IsProperty() && (lookup.type() == FIELD));
ASSERT(lookup.GetFieldIndex() == Heap::kArgumentsLengthIndex);
ASSERT(result->map()->inobject_properties() > Heap::kArgumentsLengthIndex);
// Check the state of the object.
ASSERT(result->HasFastProperties());
ASSERT(result->HasFastElements());
#endif
}
{ // --- context extension
// Create a function for the context extension objects.
Handle<Code> code = Handle<Code>(
isolate->builtins()->builtin(Builtins::kIllegal));
Handle<JSFunction> context_extension_fun =
factory->NewFunction(factory->empty_symbol(),
JS_CONTEXT_EXTENSION_OBJECT_TYPE,
JSObject::kHeaderSize,
code,
true);
Handle<String> name = factory->LookupAsciiSymbol("context_extension");
context_extension_fun->shared()->set_instance_class_name(*name);
global_context()->set_context_extension_function(*context_extension_fun);
}
{
// Setup the call-as-function delegate.
Handle<Code> code =
Handle<Code>(isolate->builtins()->builtin(
Builtins::kHandleApiCallAsFunction));
Handle<JSFunction> delegate =
factory->NewFunction(factory->empty_symbol(), JS_OBJECT_TYPE,
JSObject::kHeaderSize, code, true);
global_context()->set_call_as_function_delegate(*delegate);
delegate->shared()->DontAdaptArguments();
}
{
// Setup the call-as-constructor delegate.
Handle<Code> code =
Handle<Code>(isolate->builtins()->builtin(
Builtins::kHandleApiCallAsConstructor));
Handle<JSFunction> delegate =
factory->NewFunction(factory->empty_symbol(), JS_OBJECT_TYPE,
JSObject::kHeaderSize, code, true);
global_context()->set_call_as_constructor_delegate(*delegate);
delegate->shared()->DontAdaptArguments();
}
// Initialize the out of memory slot.
global_context()->set_out_of_memory(heap->false_value());
// Initialize the data slot.
global_context()->set_data(heap->undefined_value());
}
bool Genesis::CompileBuiltin(int index) {
Vector<const char> name = Natives::GetScriptName(index);
Handle<String> source_code =
Isolate::Current()->bootstrapper()->NativesSourceLookup(index);
return CompileNative(name, source_code);
}
bool Genesis::CompileNative(Vector<const char> name, Handle<String> source) {
HandleScope scope;
Isolate* isolate = Isolate::Current();
#ifdef ENABLE_DEBUGGER_SUPPORT
isolate->debugger()->set_compiling_natives(true);
#endif
bool result = CompileScriptCached(name,
source,
NULL,
NULL,
Handle<Context>(isolate->context()),
true);
ASSERT(isolate->has_pending_exception() != result);
if (!result) isolate->clear_pending_exception();
#ifdef ENABLE_DEBUGGER_SUPPORT
isolate->debugger()->set_compiling_natives(false);
#endif
return result;
}
bool Genesis::CompileScriptCached(Vector<const char> name,
Handle<String> source,
SourceCodeCache* cache,
v8::Extension* extension,
Handle<Context> top_context,
bool use_runtime_context) {
Factory* factory = Isolate::Current()->factory();
HandleScope scope;
Handle<SharedFunctionInfo> function_info;
// If we can't find the function in the cache, we compile a new
// function and insert it into the cache.
if (cache == NULL || !cache->Lookup(name, &function_info)) {
ASSERT(source->IsAsciiRepresentation());
Handle<String> script_name = factory->NewStringFromUtf8(name);
function_info = Compiler::Compile(
source,
script_name,
0,
0,
extension,
NULL,
Handle<String>::null(),
use_runtime_context ? NATIVES_CODE : NOT_NATIVES_CODE);
if (function_info.is_null()) return false;
if (cache != NULL) cache->Add(name, function_info);
}
// Setup the function context. Conceptually, we should clone the
// function before overwriting the context but since we're in a
// single-threaded environment it is not strictly necessary.
ASSERT(top_context->IsGlobalContext());
Handle<Context> context =
Handle<Context>(use_runtime_context
? Handle<Context>(top_context->runtime_context())
: top_context);
Handle<JSFunction> fun =
factory->NewFunctionFromSharedFunctionInfo(function_info, context);
// Call function using either the runtime object or the global
// object as the receiver. Provide no parameters.
Handle<Object> receiver =
Handle<Object>(use_runtime_context
? top_context->builtins()
: top_context->global());
bool has_pending_exception;
Handle<Object> result =
Execution::Call(fun, receiver, 0, NULL, &has_pending_exception);
if (has_pending_exception) return false;
return true;
}
#define INSTALL_NATIVE(Type, name, var) \
Handle<String> var##_name = factory->LookupAsciiSymbol(name); \
Object* var##_native = \
global_context()->builtins()->GetPropertyNoExceptionThrown(*var##_name); \
global_context()->set_##var(Type::cast(var##_native));
void Genesis::InstallNativeFunctions() {
Factory* factory = Isolate::Current()->factory();
HandleScope scope;
INSTALL_NATIVE(JSFunction, "CreateDate", create_date_fun);
INSTALL_NATIVE(JSFunction, "ToNumber", to_number_fun);
INSTALL_NATIVE(JSFunction, "ToString", to_string_fun);
INSTALL_NATIVE(JSFunction, "ToDetailString", to_detail_string_fun);
INSTALL_NATIVE(JSFunction, "ToObject", to_object_fun);
INSTALL_NATIVE(JSFunction, "ToInteger", to_integer_fun);
INSTALL_NATIVE(JSFunction, "ToUint32", to_uint32_fun);
INSTALL_NATIVE(JSFunction, "ToInt32", to_int32_fun);
INSTALL_NATIVE(JSFunction, "GlobalEval", global_eval_fun);
INSTALL_NATIVE(JSFunction, "Instantiate", instantiate_fun);
INSTALL_NATIVE(JSFunction, "ConfigureTemplateInstance",
configure_instance_fun);
INSTALL_NATIVE(JSFunction, "GetStackTraceLine", get_stack_trace_line_fun);
INSTALL_NATIVE(JSObject, "functionCache", function_cache);
}
#undef INSTALL_NATIVE
bool Genesis::InstallNatives() {
HandleScope scope;
Isolate* isolate = Isolate::Current();
Factory* factory = isolate->factory();
Heap* heap = isolate->heap();
// Create a function for the builtins object. Allocate space for the
// JavaScript builtins, a reference to the builtins object
// (itself) and a reference to the global_context directly in the object.
Handle<Code> code = Handle<Code>(
isolate->builtins()->builtin(Builtins::kIllegal));
Handle<JSFunction> builtins_fun =
factory->NewFunction(factory->empty_symbol(), JS_BUILTINS_OBJECT_TYPE,
JSBuiltinsObject::kSize, code, true);
Handle<String> name = factory->LookupAsciiSymbol("builtins");
builtins_fun->shared()->set_instance_class_name(*name);
// Allocate the builtins object.
Handle<JSBuiltinsObject> builtins =
Handle<JSBuiltinsObject>::cast(factory->NewGlobalObject(builtins_fun));
builtins->set_builtins(*builtins);
builtins->set_global_context(*global_context());
builtins->set_global_receiver(*builtins);
// Setup the 'global' properties of the builtins object. The
// 'global' property that refers to the global object is the only
// way to get from code running in the builtins context to the
// global object.
static const PropertyAttributes attributes =
static_cast<PropertyAttributes>(READ_ONLY | DONT_DELETE);
Handle<String> global_symbol = factory->LookupAsciiSymbol("global");
Handle<Object> global_obj(global_context()->global());
SetLocalPropertyNoThrow(builtins, global_symbol, global_obj, attributes);
// Setup the reference from the global object to the builtins object.
JSGlobalObject::cast(global_context()->global())->set_builtins(*builtins);
// Create a bridge function that has context in the global context.
Handle<JSFunction> bridge =
factory->NewFunction(factory->empty_symbol(), factory->undefined_value());
ASSERT(bridge->context() == *isolate->global_context());
// Allocate the builtins context.
Handle<Context> context =
factory->NewFunctionContext(Context::MIN_CONTEXT_SLOTS, bridge);
context->set_global(*builtins); // override builtins global object
global_context()->set_runtime_context(*context);
{ // -- S c r i p t
// Builtin functions for Script.
Handle<JSFunction> script_fun =
InstallFunction(builtins, "Script", JS_VALUE_TYPE, JSValue::kSize,
isolate->initial_object_prototype(),
Builtins::kIllegal, false);
Handle<JSObject> prototype =
factory->NewJSObject(isolate->object_function(), TENURED);
SetPrototype(script_fun, prototype);
global_context()->set_script_function(*script_fun);
// Add 'source' and 'data' property to scripts.
PropertyAttributes common_attributes =
static_cast<PropertyAttributes>(DONT_ENUM | DONT_DELETE | READ_ONLY);
Handle<Proxy> proxy_source = factory->NewProxy(&Accessors::ScriptSource);
Handle<DescriptorArray> script_descriptors =
factory->CopyAppendProxyDescriptor(
factory->empty_descriptor_array(),
factory->LookupAsciiSymbol("source"),
proxy_source,
common_attributes);
Handle<Proxy> proxy_name = factory->NewProxy(&Accessors::ScriptName);
script_descriptors =
factory->CopyAppendProxyDescriptor(
script_descriptors,
factory->LookupAsciiSymbol("name"),
proxy_name,
common_attributes);
Handle<Proxy> proxy_id = factory->NewProxy(&Accessors::ScriptId);
script_descriptors =
factory->CopyAppendProxyDescriptor(
script_descriptors,
factory->LookupAsciiSymbol("id"),
proxy_id,
common_attributes);
Handle<Proxy> proxy_line_offset =
factory->NewProxy(&Accessors::ScriptLineOffset);
script_descriptors =
factory->CopyAppendProxyDescriptor(
script_descriptors,
factory->LookupAsciiSymbol("line_offset"),
proxy_line_offset,
common_attributes);
Handle<Proxy> proxy_column_offset =
factory->NewProxy(&Accessors::ScriptColumnOffset);
script_descriptors =
factory->CopyAppendProxyDescriptor(
script_descriptors,
factory->LookupAsciiSymbol("column_offset"),
proxy_column_offset,
common_attributes);
Handle<Proxy> proxy_data = factory->NewProxy(&Accessors::ScriptData);
script_descriptors =
factory->CopyAppendProxyDescriptor(
script_descriptors,
factory->LookupAsciiSymbol("data"),
proxy_data,
common_attributes);
Handle<Proxy> proxy_type = factory->NewProxy(&Accessors::ScriptType);
script_descriptors =
factory->CopyAppendProxyDescriptor(
script_descriptors,
factory->LookupAsciiSymbol("type"),
proxy_type,
common_attributes);
Handle<Proxy> proxy_compilation_type =
factory->NewProxy(&Accessors::ScriptCompilationType);
script_descriptors =
factory->CopyAppendProxyDescriptor(
script_descriptors,
factory->LookupAsciiSymbol("compilation_type"),
proxy_compilation_type,
common_attributes);
Handle<Proxy> proxy_line_ends =
factory->NewProxy(&Accessors::ScriptLineEnds);
script_descriptors =
factory->CopyAppendProxyDescriptor(
script_descriptors,
factory->LookupAsciiSymbol("line_ends"),
proxy_line_ends,
common_attributes);
Handle<Proxy> proxy_context_data =
factory->NewProxy(&Accessors::ScriptContextData);
script_descriptors =
factory->CopyAppendProxyDescriptor(
script_descriptors,
factory->LookupAsciiSymbol("context_data"),
proxy_context_data,
common_attributes);
Handle<Proxy> proxy_eval_from_script =
factory->NewProxy(&Accessors::ScriptEvalFromScript);
script_descriptors =
factory->CopyAppendProxyDescriptor(
script_descriptors,
factory->LookupAsciiSymbol("eval_from_script"),
proxy_eval_from_script,
common_attributes);
Handle<Proxy> proxy_eval_from_script_position =
factory->NewProxy(&Accessors::ScriptEvalFromScriptPosition);
script_descriptors =
factory->CopyAppendProxyDescriptor(
script_descriptors,
factory->LookupAsciiSymbol("eval_from_script_position"),
proxy_eval_from_script_position,
common_attributes);
Handle<Proxy> proxy_eval_from_function_name =
factory->NewProxy(&Accessors::ScriptEvalFromFunctionName);
script_descriptors =
factory->CopyAppendProxyDescriptor(
script_descriptors,
factory->LookupAsciiSymbol("eval_from_function_name"),
proxy_eval_from_function_name,
common_attributes);
Handle<Map> script_map = Handle<Map>(script_fun->initial_map());
script_map->set_instance_descriptors(*script_descriptors);
// Allocate the empty script.
Handle<Script> script = factory->NewScript(factory->empty_string());
script->set_type(Smi::FromInt(Script::TYPE_NATIVE));
heap->public_set_empty_script(*script);
}
{
// Builtin function for OpaqueReference -- a JSValue-based object,
// that keeps its field isolated from JavaScript code. It may store
// objects, that JavaScript code may not access.
Handle<JSFunction> opaque_reference_fun =
InstallFunction(builtins, "OpaqueReference", JS_VALUE_TYPE,
JSValue::kSize,
isolate->initial_object_prototype(),
Builtins::kIllegal, false);
Handle<JSObject> prototype =
factory->NewJSObject(isolate->object_function(), TENURED);
SetPrototype(opaque_reference_fun, prototype);
global_context()->set_opaque_reference_function(*opaque_reference_fun);
}
{ // --- I n t e r n a l A r r a y ---
// An array constructor on the builtins object that works like
// the public Array constructor, except that its prototype
// doesn't inherit from Object.prototype.
// To be used only for internal work by builtins. Instances
// must not be leaked to user code.
// Only works correctly when called as a constructor. The normal
// Array code uses Array.prototype as prototype when called as
// a function.
Handle<JSFunction> array_function =
InstallFunction(builtins,
"InternalArray",
JS_ARRAY_TYPE,
JSArray::kSize,
isolate->initial_object_prototype(),
Builtins::kArrayCode,
true);
Handle<JSObject> prototype =
factory->NewJSObject(isolate->object_function(), TENURED);
SetPrototype(array_function, prototype);
array_function->shared()->set_construct_stub(
isolate->builtins()->builtin(Builtins::kArrayConstructCode));
array_function->shared()->DontAdaptArguments();
// Make "length" magic on instances.
Handle<DescriptorArray> array_descriptors =
factory->CopyAppendProxyDescriptor(
factory->empty_descriptor_array(),
factory->length_symbol(),
factory->NewProxy(&Accessors::ArrayLength),
static_cast<PropertyAttributes>(DONT_ENUM | DONT_DELETE));
array_function->initial_map()->set_instance_descriptors(
*array_descriptors);
}
if (FLAG_disable_native_files) {
PrintF("Warning: Running without installed natives!\n");
return true;
}
// Install natives.
for (int i = Natives::GetDebuggerCount();
i < Natives::GetBuiltinsCount();
i++) {
Vector<const char> name = Natives::GetScriptName(i);
if (!CompileBuiltin(i)) return false;
// TODO(ager): We really only need to install the JS builtin
// functions on the builtins object after compiling and running
// runtime.js.
if (!InstallJSBuiltins(builtins)) return false;
}
InstallNativeFunctions();
// Store the map for the string prototype after the natives has been compiled
// and the String function has been setup.
Handle<JSFunction> string_function(global_context()->string_function());
ASSERT(JSObject::cast(
string_function->initial_map()->prototype())->HasFastProperties());
global_context()->set_string_function_prototype_map(
HeapObject::cast(string_function->initial_map()->prototype())->map());
// Install Function.prototype.call and apply.
{ Handle<String> key = factory->function_class_symbol();
Handle<JSFunction> function =
Handle<JSFunction>::cast(GetProperty(isolate->global(), key));
Handle<JSObject> proto =
Handle<JSObject>(JSObject::cast(function->instance_prototype()));
// Install the call and the apply functions.
Handle<JSFunction> call =
InstallFunction(proto, "call", JS_OBJECT_TYPE, JSObject::kHeaderSize,
Handle<JSObject>::null(),
Builtins::kFunctionCall,
false);
Handle<JSFunction> apply =
InstallFunction(proto, "apply", JS_OBJECT_TYPE, JSObject::kHeaderSize,
Handle<JSObject>::null(),
Builtins::kFunctionApply,
false);
// Make sure that Function.prototype.call appears to be compiled.
// The code will never be called, but inline caching for call will
// only work if it appears to be compiled.
call->shared()->DontAdaptArguments();
ASSERT(call->is_compiled());
// Set the expected parameters for apply to 2; required by builtin.
apply->shared()->set_formal_parameter_count(2);
// Set the lengths for the functions to satisfy ECMA-262.
call->shared()->set_length(1);
apply->shared()->set_length(2);
}
InstallBuiltinFunctionIds();
// Create a constructor for RegExp results (a variant of Array that
// predefines the two properties index and match).
{
// RegExpResult initial map.
// Find global.Array.prototype to inherit from.
Handle<JSFunction> array_constructor(global_context()->array_function());
Handle<JSObject> array_prototype(
JSObject::cast(array_constructor->instance_prototype()));
// Add initial map.
Handle<Map> initial_map =
factory->NewMap(JS_ARRAY_TYPE, JSRegExpResult::kSize);
initial_map->set_constructor(*array_constructor);
// Set prototype on map.
initial_map->set_non_instance_prototype(false);
initial_map->set_prototype(*array_prototype);
// Update map with length accessor from Array and add "index" and "input".
Handle<Map> array_map(global_context()->js_array_map());
Handle<DescriptorArray> array_descriptors(
array_map->instance_descriptors());
ASSERT_EQ(1, array_descriptors->number_of_descriptors());
Handle<DescriptorArray> reresult_descriptors =
factory->NewDescriptorArray(3);
reresult_descriptors->CopyFrom(0, *array_descriptors, 0);
int enum_index = 0;
{
FieldDescriptor index_field(heap->index_symbol(),
JSRegExpResult::kIndexIndex,
NONE,
enum_index++);
reresult_descriptors->Set(1, &index_field);
}
{
FieldDescriptor input_field(heap->input_symbol(),
JSRegExpResult::kInputIndex,
NONE,
enum_index++);
reresult_descriptors->Set(2, &input_field);
}
reresult_descriptors->Sort();
initial_map->set_inobject_properties(2);
initial_map->set_pre_allocated_property_fields(2);
initial_map->set_unused_property_fields(0);
initial_map->set_instance_descriptors(*reresult_descriptors);
global_context()->set_regexp_result_map(*initial_map);
}
#ifdef DEBUG
builtins->Verify();
#endif
return true;
}
static Handle<JSObject> ResolveBuiltinIdHolder(
Handle<Context> global_context,
const char* holder_expr) {
Factory* factory = Isolate::Current()->factory();
Handle<GlobalObject> global(global_context->global());
const char* period_pos = strchr(holder_expr, '.');
if (period_pos == NULL) {
return Handle<JSObject>::cast(
GetProperty(global, factory->LookupAsciiSymbol(holder_expr)));
}
ASSERT_EQ(".prototype", period_pos);
Vector<const char> property(holder_expr,
static_cast<int>(period_pos - holder_expr));
Handle<JSFunction> function = Handle<JSFunction>::cast(
GetProperty(global, factory->LookupSymbol(property)));
return Handle<JSObject>(JSObject::cast(function->prototype()));
}
static void InstallBuiltinFunctionId(Handle<JSObject> holder,
const char* function_name,
BuiltinFunctionId id) {
Handle<String> name = FACTORY->LookupAsciiSymbol(function_name);
Object* function_object = holder->GetProperty(*name)->ToObjectUnchecked();
Handle<JSFunction> function(JSFunction::cast(function_object));
function->shared()->set_function_data(Smi::FromInt(id));
}
void Genesis::InstallBuiltinFunctionIds() {
HandleScope scope;
#define INSTALL_BUILTIN_ID(holder_expr, fun_name, name) \
{ \
Handle<JSObject> holder = ResolveBuiltinIdHolder( \
global_context(), #holder_expr); \
BuiltinFunctionId id = k##name; \
InstallBuiltinFunctionId(holder, #fun_name, id); \
}
FUNCTIONS_WITH_ID_LIST(INSTALL_BUILTIN_ID)
#undef INSTALL_BUILTIN_ID
}
// Do not forget to update macros.py with named constant
// of cache id.
#define JSFUNCTION_RESULT_CACHE_LIST(F) \
F(16, global_context()->regexp_function())
static FixedArray* CreateCache(int size, JSFunction* factory) {
// Caches are supposed to live for a long time, allocate in old space.
int array_size = JSFunctionResultCache::kEntriesIndex + 2 * size;
// Cannot use cast as object is not fully initialized yet.
JSFunctionResultCache* cache = reinterpret_cast<JSFunctionResultCache*>(
*FACTORY->NewFixedArrayWithHoles(array_size, TENURED));
cache->set(JSFunctionResultCache::kFactoryIndex, factory);
cache->MakeZeroSize();
return cache;
}
void Genesis::InstallJSFunctionResultCaches() {
const int kNumberOfCaches = 0 +
#define F(size, func) + 1
JSFUNCTION_RESULT_CACHE_LIST(F)
#undef F
;
Handle<FixedArray> caches = FACTORY->NewFixedArray(kNumberOfCaches, TENURED);
int index = 0;
#define F(size, func) do { \
FixedArray* cache = CreateCache((size), (func)); \
caches->set(index++, cache); \
} while (false)
JSFUNCTION_RESULT_CACHE_LIST(F);
#undef F
global_context()->set_jsfunction_result_caches(*caches);
}
void Genesis::InitializeNormalizedMapCaches() {
Handle<FixedArray> array(
FACTORY->NewFixedArray(NormalizedMapCache::kEntries, TENURED));
global_context()->set_normalized_map_cache(NormalizedMapCache::cast(*array));
}
bool Bootstrapper::InstallExtensions(Handle<Context> global_context,
v8::ExtensionConfiguration* extensions) {
Isolate* isolate = Isolate::Current();
BootstrapperActive active;
SaveContext saved_context(isolate);
isolate->set_context(*global_context);
if (!Genesis::InstallExtensions(global_context, extensions)) return false;
Genesis::InstallSpecialObjects(global_context);
return true;
}
void Genesis::InstallSpecialObjects(Handle<Context> global_context) {
Factory* factory = Isolate::Current()->factory();
HandleScope scope;
Handle<JSGlobalObject> js_global(
JSGlobalObject::cast(global_context->global()));
// Expose the natives in global if a name for it is specified.
if (FLAG_expose_natives_as != NULL && strlen(FLAG_expose_natives_as) != 0) {
Handle<String> natives_string =
factory->LookupAsciiSymbol(FLAG_expose_natives_as);
SetLocalPropertyNoThrow(js_global, natives_string,
Handle<JSObject>(js_global->builtins()), DONT_ENUM);
}
Handle<Object> Error = GetProperty(js_global, "Error");
if (Error->IsJSObject()) {
Handle<String> name = factory->LookupAsciiSymbol("stackTraceLimit");
SetLocalPropertyNoThrow(Handle<JSObject>::cast(Error),
name,
Handle<Smi>(Smi::FromInt(FLAG_stack_trace_limit)),
NONE);
}
#ifdef ENABLE_DEBUGGER_SUPPORT
// Expose the debug global object in global if a name for it is specified.
if (FLAG_expose_debug_as != NULL && strlen(FLAG_expose_debug_as) != 0) {
Debug* debug = Isolate::Current()->debug();
// If loading fails we just bail out without installing the
// debugger but without tanking the whole context.
if (!debug->Load()) return;
// Set the security token for the debugger context to the same as
// the shell global context to allow calling between these (otherwise
// exposing debug global object doesn't make much sense).
debug->debug_context()->set_security_token(
global_context->security_token());
Handle<String> debug_string =
factory->LookupAsciiSymbol(FLAG_expose_debug_as);
Handle<Object> global_proxy(debug->debug_context()->global_proxy());
SetLocalPropertyNoThrow(js_global, debug_string, global_proxy, DONT_ENUM);
}
#endif
}
bool Genesis::InstallExtensions(Handle<Context> global_context,
v8::ExtensionConfiguration* extensions) {
// TODO(isolates): Extensions on multiple isolates may take a little more
// effort. (The external API reads 'ignore'-- does that mean
// we can break the interface?)
// Clear coloring of extension list
v8::RegisteredExtension* current = v8::RegisteredExtension::first_extension();
while (current != NULL) {
current->set_state(v8::UNVISITED);
current = current->next();
}
// Install auto extensions.
current = v8::RegisteredExtension::first_extension();
while (current != NULL) {
if (current->extension()->auto_enable())
InstallExtension(current);
current = current->next();
}
if (FLAG_expose_gc) InstallExtension("v8/gc");
if (FLAG_expose_externalize_string) InstallExtension("v8/externalize");
if (extensions == NULL) return true;
// Install required extensions
int count = v8::ImplementationUtilities::GetNameCount(extensions);
const char** names = v8::ImplementationUtilities::GetNames(extensions);
for (int i = 0; i < count; i++) {
if (!InstallExtension(names[i]))
return false;
}
return true;
}
// Installs a named extension. This methods is unoptimized and does
// not scale well if we want to support a large number of extensions.
bool Genesis::InstallExtension(const char* name) {
v8::RegisteredExtension* current = v8::RegisteredExtension::first_extension();
// Loop until we find the relevant extension
while (current != NULL) {
if (strcmp(name, current->extension()->name()) == 0) break;
current = current->next();
}
// Didn't find the extension; fail.
if (current == NULL) {
v8::Utils::ReportApiFailure(
"v8::Context::New()", "Cannot find required extension");
return false;
}
return InstallExtension(current);
}
bool Genesis::InstallExtension(v8::RegisteredExtension* current) {
HandleScope scope;
if (current->state() == v8::INSTALLED) return true;
// The current node has already been visited so there must be a
// cycle in the dependency graph; fail.
if (current->state() == v8::VISITED) {
v8::Utils::ReportApiFailure(
"v8::Context::New()", "Circular extension dependency");
return false;
}
ASSERT(current->state() == v8::UNVISITED);
current->set_state(v8::VISITED);
v8::Extension* extension = current->extension();
// Install the extension's dependencies
for (int i = 0; i < extension->dependency_count(); i++) {
if (!InstallExtension(extension->dependencies()[i])) return false;
}
Isolate* isolate = Isolate::Current();
Vector<const char> source = CStrVector(extension->source());
Handle<String> source_code = isolate->factory()->NewStringFromAscii(source);
bool result = CompileScriptCached(CStrVector(extension->name()),
source_code,
isolate->bootstrapper()->extensions_cache(),
extension,
Handle<Context>(isolate->context()),
false);
ASSERT(isolate->has_pending_exception() != result);
if (!result) {
isolate->clear_pending_exception();
}
current->set_state(v8::INSTALLED);
return result;
}
bool Genesis::InstallJSBuiltins(Handle<JSBuiltinsObject> builtins) {
HandleScope scope;
for (int i = 0; i < Builtins::NumberOfJavaScriptBuiltins(); i++) {
Builtins::JavaScript id = static_cast<Builtins::JavaScript>(i);
Handle<String> name = FACTORY->LookupAsciiSymbol(Builtins::GetName(id));
Object* function_object = builtins->GetPropertyNoExceptionThrown(*name);
Handle<JSFunction> function
= Handle<JSFunction>(JSFunction::cast(function_object));
builtins->set_javascript_builtin(id, *function);
Handle<SharedFunctionInfo> shared
= Handle<SharedFunctionInfo>(function->shared());
if (!EnsureCompiled(shared, CLEAR_EXCEPTION)) return false;
// Set the code object on the function object.
function->ReplaceCode(function->shared()->code());
builtins->set_javascript_builtin_code(id, shared->code());
}
return true;
}
bool Genesis::ConfigureGlobalObjects(
v8::Handle<v8::ObjectTemplate> global_proxy_template) {
Handle<JSObject> global_proxy(
JSObject::cast(global_context()->global_proxy()));
Handle<JSObject> inner_global(JSObject::cast(global_context()->global()));
if (!global_proxy_template.IsEmpty()) {
// Configure the global proxy object.
Handle<ObjectTemplateInfo> proxy_data =
v8::Utils::OpenHandle(*global_proxy_template);
if (!ConfigureApiObject(global_proxy, proxy_data)) return false;
// Configure the inner global object.
Handle<FunctionTemplateInfo> proxy_constructor(
FunctionTemplateInfo::cast(proxy_data->constructor()));
if (!proxy_constructor->prototype_template()->IsUndefined()) {
Handle<ObjectTemplateInfo> inner_data(
ObjectTemplateInfo::cast(proxy_constructor->prototype_template()));
if (!ConfigureApiObject(inner_global, inner_data)) return false;
}
}
SetObjectPrototype(global_proxy, inner_global);
return true;
}
bool Genesis::ConfigureApiObject(Handle<JSObject> object,
Handle<ObjectTemplateInfo> object_template) {
ASSERT(!object_template.is_null());
ASSERT(object->IsInstanceOf(
FunctionTemplateInfo::cast(object_template->constructor())));
Isolate* isolate = Isolate::Current();
bool pending_exception = false;
Handle<JSObject> obj =
Execution::InstantiateObject(object_template, &pending_exception);
if (pending_exception) {
ASSERT(isolate->has_pending_exception());
isolate->clear_pending_exception();
return false;
}
TransferObject(obj, object);
return true;
}
void Genesis::TransferNamedProperties(Handle<JSObject> from,
Handle<JSObject> to) {
if (from->HasFastProperties()) {
Handle<DescriptorArray> descs =
Handle<DescriptorArray>(from->map()->instance_descriptors());
for (int i = 0; i < descs->number_of_descriptors(); i++) {
PropertyDetails details = PropertyDetails(descs->GetDetails(i));
switch (details.type()) {
case FIELD: {
HandleScope inner;
Handle<String> key = Handle<String>(descs->GetKey(i));
int index = descs->GetFieldIndex(i);
Handle<Object> value = Handle<Object>(from->FastPropertyAt(index));
SetLocalPropertyNoThrow(to, key, value, details.attributes());
break;
}
case CONSTANT_FUNCTION: {
HandleScope inner;
Handle<String> key = Handle<String>(descs->GetKey(i));
Handle<JSFunction> fun =
Handle<JSFunction>(descs->GetConstantFunction(i));
SetLocalPropertyNoThrow(to, key, fun, details.attributes());
break;
}
case CALLBACKS: {
LookupResult result;
to->LocalLookup(descs->GetKey(i), &result);
// If the property is already there we skip it
if (result.IsProperty()) continue;
HandleScope inner;
ASSERT(!to->HasFastProperties());
// Add to dictionary.
Handle<String> key = Handle<String>(descs->GetKey(i));
Handle<Object> callbacks(descs->GetCallbacksObject(i));
PropertyDetails d =
PropertyDetails(details.attributes(), CALLBACKS, details.index());
SetNormalizedProperty(to, key, callbacks, d);
break;
}
case MAP_TRANSITION:
case EXTERNAL_ARRAY_TRANSITION:
case CONSTANT_TRANSITION:
case NULL_DESCRIPTOR:
// Ignore non-properties.
break;
case NORMAL:
// Do not occur since the from object has fast properties.
case INTERCEPTOR:
// No element in instance descriptors have interceptor type.
UNREACHABLE();
break;
}
}
} else {
Handle<StringDictionary> properties =
Handle<StringDictionary>(from->property_dictionary());
int capacity = properties->Capacity();
for (int i = 0; i < capacity; i++) {
Object* raw_key(properties->KeyAt(i));
if (properties->IsKey(raw_key)) {
ASSERT(raw_key->IsString());
// If the property is already there we skip it.
LookupResult result;
to->LocalLookup(String::cast(raw_key), &result);
if (result.IsProperty()) continue;
// Set the property.
Handle<String> key = Handle<String>(String::cast(raw_key));
Handle<Object> value = Handle<Object>(properties->ValueAt(i));
if (value->IsJSGlobalPropertyCell()) {
value = Handle<Object>(JSGlobalPropertyCell::cast(*value)->value());
}
PropertyDetails details = properties->DetailsAt(i);
SetLocalPropertyNoThrow(to, key, value, details.attributes());
}
}
}
}
void Genesis::TransferIndexedProperties(Handle<JSObject> from,
Handle<JSObject> to) {
// Cloning the elements array is sufficient.
Handle<FixedArray> from_elements =
Handle<FixedArray>(FixedArray::cast(from->elements()));
Handle<FixedArray> to_elements = FACTORY->CopyFixedArray(from_elements);
to->set_elements(*to_elements);
}
void Genesis::TransferObject(Handle<JSObject> from, Handle<JSObject> to) {
HandleScope outer;
ASSERT(!from->IsJSArray());
ASSERT(!to->IsJSArray());
TransferNamedProperties(from, to);
TransferIndexedProperties(from, to);
// Transfer the prototype (new map is needed).
Handle<Map> old_to_map = Handle<Map>(to->map());
Handle<Map> new_to_map = FACTORY->CopyMapDropTransitions(old_to_map);
new_to_map->set_prototype(from->map()->prototype());
to->set_map(*new_to_map);
}
void Genesis::MakeFunctionInstancePrototypeWritable() {
// The maps with writable prototype are created in CreateEmptyFunction
// and CreateStrictModeFunctionMaps respectively. Initially the maps are
// created with read-only prototype for JS builtins processing.
ASSERT(!function_instance_map_writable_prototype_.is_null());
ASSERT(!strict_mode_function_instance_map_writable_prototype_.is_null());
// Replace function instance maps to make prototype writable.
global_context()->set_function_map(
*function_instance_map_writable_prototype_);
global_context()->set_strict_mode_function_map(
*strict_mode_function_instance_map_writable_prototype_);
}
Genesis::Genesis(Handle<Object> global_object,
v8::Handle<v8::ObjectTemplate> global_template,
v8::ExtensionConfiguration* extensions) {
Isolate* isolate = Isolate::Current();
result_ = Handle<Context>::null();
// If V8 isn't running and cannot be initialized, just return.
if (!V8::IsRunning() && !V8::Initialize(NULL)) return;
// Before creating the roots we must save the context and restore it
// on all function exits.
HandleScope scope;
SaveContext saved_context(isolate);
Handle<Context> new_context = Snapshot::NewContextFromSnapshot();
if (!new_context.is_null()) {
global_context_ =
Handle<Context>::cast(isolate->global_handles()->Create(*new_context));
AddToWeakGlobalContextList(*global_context_);
isolate->set_context(*global_context_);
isolate->counters()->contexts_created_by_snapshot()->Increment();
Handle<GlobalObject> inner_global;
Handle<JSGlobalProxy> global_proxy =
CreateNewGlobals(global_template,
global_object,
&inner_global);
HookUpGlobalProxy(inner_global, global_proxy);
HookUpInnerGlobal(inner_global);
if (!ConfigureGlobalObjects(global_template)) return;
} else {
// We get here if there was no context snapshot.
CreateRoots();
Handle<JSFunction> empty_function = CreateEmptyFunction();
CreateStrictModeFunctionMaps(empty_function);
Handle<GlobalObject> inner_global;
Handle<JSGlobalProxy> global_proxy =
CreateNewGlobals(global_template, global_object, &inner_global);
HookUpGlobalProxy(inner_global, global_proxy);
InitializeGlobal(inner_global, empty_function);
InstallJSFunctionResultCaches();
InitializeNormalizedMapCaches();
if (!InstallNatives()) return;
MakeFunctionInstancePrototypeWritable();
if (!ConfigureGlobalObjects(global_template)) return;
isolate->counters()->contexts_created_from_scratch()->Increment();
}
result_ = global_context_;
}
// Support for thread preemption.
// Reserve space for statics needing saving and restoring.
int Bootstrapper::ArchiveSpacePerThread() {
return sizeof(NestingCounterType);
}
// Archive statics that are thread local.
char* Bootstrapper::ArchiveState(char* to) {
*reinterpret_cast<NestingCounterType*>(to) = nesting_;
nesting_ = 0;
return to + sizeof(NestingCounterType);
}
// Restore statics that are thread local.
char* Bootstrapper::RestoreState(char* from) {
nesting_ = *reinterpret_cast<NestingCounterType*>(from);
return from + sizeof(NestingCounterType);
}
// Called when the top-level V8 mutex is destroyed.
void Bootstrapper::FreeThreadResources() {
ASSERT(!IsActive());
}
} } // namespace v8::internal